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从能量角度出发,在理想弹塑性土体模型下建立了拉力型锚杆的势能方程,在最小势能约束条件下推导出了锚杆拉拔荷载与锚固体长度的关系解析解,证明了锚杆极限锚固长度的存在,获得了不同土质环境下锚固长度的取值规律及其影响因素。引入模糊理论原理构建了锚杆失效的能量法模糊判别模型,并对模型中的失效隶属函数和临界模糊区间作了具体分析。通过算例,将本文方法与工程实际进行对比,结果表明:本文的计算模型可行有效,能量法模糊判别不仅能对锚杆可靠度做较合理分析,并能对大多数锚杆破坏失效的案例作出解释。
From the energy point of view, the potential energy equation of the tension-type anchor is established under the ideal elastic-plastic soil model, and the analytical solution of the relationship between the anchor load and the length of the anchor is derived under the minimum potential energy constraint. The existence of limit anchorage length, obtained the value of anchoring length in different soil environment and its influencing factors. By introducing the principle of fuzzy theory, an energy law fuzzy discriminant model of bolt failure is constructed, and the failure membership function and critical fuzzy interval in the model are analyzed specifically. The result shows that the calculation model in this paper is feasible and effective. The fuzzy method of energy method can not only make a reasonable analysis of the reliability of anchor bolts, but also can analyze the failure cases of most bolts Explain.